I got this recipe from a Good Housekeeping book called The Complete Book of Home Baking (1989). I have modified it slightly (by adding cocoa powder), but otherwise it is largely the same
Makes 20 cookies
Cream butter, vanilla, and both sugars until pale and fluffy
Gradually beat in egg
Sift in flour, salt, and cocoa powder
Add nuts and chocolate chips and fold together until it forms a dough
Line 2 baking trays with greasproof paper
Add 10 equal sized blobs of dough to each sheet, evenly spaced (it shouldn't spread too much)
Bake in oven at 180c (350f) mark 4 for 12-15mins or until they just start to brown
Cool on baking sheet for a minute then transfer to a wire rack to finish cooling.
Have a nice cup of tea and a bit of a sit down, your work is done yum yum! :)